Generation of intense subnanosecond 058–080-μm pulses with a flashlamp-pumped dye laser

Negran, T. J.; Glass, A. M.

doi:10.1364/ao.17.002812

Cited by 4 publications

(5 citation statements)

References 10 publications

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“…Thus, such a difference is mainly due to the emission of the second photoisomer, with ≫ . The difference in the fluorescence spectra in the 700−740 nm range would indicate a maximum of emission from P2 in the above region, which coincides with the DTDCI laser emission zone. − …”

Section: Resultsmentioning

confidence: 81%

“…The difference in the fluorescence spectra in the 700-740 nm range would indicate a maximum of emission from P2 in the above region, which coincides with the DTDCI laser emission zone. [27][28][29] Assuming the mirror hypothesis, the P2 absorption spectrum should be shifted toward longer wavelengths than the N and P1 absorption spectra, with a maximum around 680 nm. This idea agrees with the fact that the values obtained for σ 3 at 600, 637, and 657 nm are smaller that the respective σ 1 and σ 2 .…”

Section: Resultsmentioning

confidence: 99%

“…[18][19][20][21][22][23][24][25] DTDCI is used as a laser dye for pulsed systems in the 700-760 nm region and as a saturable absorber in passive "mode-locking" techniques, when used with cresyl violet and Rhodamine 101 lasers. [26][27][28][29] Like other cyanines dyes, DTDCI shows very strong absorption in the visible and near-UV regions and presents a reversible photoisomerization process.…”

Section: Introductionmentioning

confidence: 99%

“…However, the above-mentioned model does not provide an adequate explanation for the photoisomerization process in all cyanines. 3,3‘-Diethylthiadicarbocyanine iodide (DTDCI, Chart ) is an example of this statement, since authors have investigated the photoisomerization mechanisms and photophysical and spectroscopic properties of DTDCI for more than 20 years, obtaining controversial results. − DTDCI is used as a laser dye for pulsed systems in the 700−760 nm region and as a saturable absorber in passive “mode-locking” techniques, when used with cresyl violet and Rhodamine 101 lasers. − Like other cyanines dyes, DTDCI shows very strong absorption in the visible and near-UV regions and presents a reversible photoisomerization process.

1 Structure of 3,3‘-Diethylthiadicarbocyanine Iodide (DTDCI) …”

Section: Introductionmentioning

confidence: 99%

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Kinetic Analysis of a Double Photoisomerization of the DTDCI Cyanine Dye

1996

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Simultaneous laser absorption spectroscopy and laser induced fluorescence under steady-state conditions, together with analysis of fluorescence spectra at various excitation conditions, have been carried out to elucidate the photoisomerization processes of 3,3′-diethylthiadicarbocyanine iodide (DTDCI) in methanol solution. The data were obtained by varying the laser fluence at several wavelengths, and fits were performed considering two kinetic models, involving two or three isomers. The results point to the formation of a second photoisomer under high excitation fluences. Its absorption spectrum is shifted toward longer wavelengths with respect to the spectra corresponding to the normal species and the first photoisomer, which are strongly overlapped. Changes in the fluorescence spectra with the excitation fluence, appearing in the DTDCI lasing region, are attributed to the second photoisomer emission. Values are obtained for the photoisomerization and backphotoisomerization quantum yields, as well as for the thermal ground-state back-isomerization yield and ground state absorption cross sections at several wavelengths for both photoisomers. IntroductionThe photoisomerization dynamics of polymethine cyanine dyes has been extensively considered from both the theoretical and experimental points of view. The formation of photoisomers has been analyzed through different experimental techniques such as flash photolysis, fluorescence, picosecond timeresolved spectroscopy, optoacoustic techniques, and others. 1-6 Rulliere's model for two isomeric species, corresponding to the normal conformer and to the photoisomer, is the most widely used model to explain the photophysical behavior of these kinds of molecules. Good agreement has been found between this model and the experimental results with several cyanine dyes such as 3,3′-diethyloxadicarbocyanine iodide (DODCI), 3,3′-diethylthiacarbocyanine iodide (DTCI), 3,3′-diethyloxacarbocyanine iodide (DOCI), merocyanine 540, and some others. On the basis of this model, the photophysical processes in these carbocyanines are thought to be well-understood, and the kinetic and spectroscopic parameters are well-known. [7][8][9][10][11][12][13][14][15][16][17] However, the above-mentioned model does not provide an adequate explanation for the photoisomerization process in all cyanines. 3,3′-Diethylthiadicarbocyanine iodide (DTDCI, Chart 1) is an example of this statement, since authors have investigated the photoisomerization mechanisms and photophysical and spectroscopic properties of DTDCI for more than 20 years, obtaining controversial results. 18-25 DTDCI is used as a laser dye for pulsed systems in the 700-760 nm region and as a saturable absorber in passive "mode-locking" techniques, when used with cresyl violet and Rhodamine 101 lasers. 26-29 Like other cyanines dyes, DTDCI shows very strong absorption in the visible and near-UV regions and presents a reversible photoisomerization process.The first evidence of a photoisomer (P1) in ethanol solutions of DTDCI was reported by ...

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Section: Resultsmentioning

confidence: 81%

Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

1 Structure of 3,3‘-Diethylthiadicarbocyanine Iodide (DTDCI) …”

Section: Introductionmentioning

confidence: 99%

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Kinetic Analysis of a Double Photoisomerization of the DTDCI Cyanine Dye

1996

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“…10,11 The experimental arrangement is shown in Fig. 10,11 The experimental arrangement is shown in Fig.…”

Section: Experimental Checkmentioning

confidence: 99%

Tunable subnanosecond pulse generation in a dye laser using overlapped pump pulses

Delev

Deneva

Nenchev

et al. 2001

Review of Scientific Instruments

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Articles you may be interested inDeveloping a narrow-line laser spectrometer based on a tunable continuous-wave dye laser Rev. Sci. Instrum. 85, 083113 (2014); 10.1063/1.4893014 Electrostatically tunable optomechanical "zipper" cavity laser Direct generation of a tunable nearly transform-limited picosecond pulse in the ultraviolet region using a distributed-feedback dye laser Rev. Sci. Instrum. 74, 28 (2003); 10.1063/1.1529298Efficient and stable operation of an Ar + -pumped continuous-wave ring laser from 505-560 nm using a coumarin laser dye Rev.We report a simple technique for generation of tunable subnanosecond pulses ͑0.2-0.4 ns͒ based on single spike selection from the relaxation oscillations in a dye laser using preformed and overlapping in time excitation pulses. The pulses were obtained by temporal division of a 5-50 ns initial pulse using a Pockels cell with a 1-2 ns switching time and an optical delay time. The proposed technique widens the choice of suitable dye lasers in which the single spike selection technique may be applied, to include dye lasers excited by a Q-switched solid-state laser or a Cu-vapor laser. Other advantages to this technique are the shortened length of the generated subnanosecond pulse, the increased energetic output, higher reproducibility, and the possibility for synchronization of spike generation to an external signal accurate to within 2-3 ns.

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Recent Advances in High-Power Tunable Lasers (UV, Visible, and Near IR)

Smiley¹

1981

Advances in Electronics and Electron Physics Volume 56

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Generation of intense subnanosecond 058–080-μm pulses with a flashlamp-pumped dye laser

Cited by 4 publications

References 10 publications

Kinetic Analysis of a Double Photoisomerization of the DTDCI Cyanine Dye

Kinetic Analysis of a Double Photoisomerization of the DTDCI Cyanine Dye

Tunable subnanosecond pulse generation in a dye laser using overlapped pump pulses

Recent Advances in High-Power Tunable Lasers (UV, Visible, and Near IR)

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